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Effect of altering the non-structural: structural carbohydrate ratio in a pasture diet on milk production and ruminal metabolites in cows in early and late lactation

Published online by Cambridge University Press:  02 September 2010

V. R. Carruthers ,
P. G. Neil  and
D. E. Dalley
V. R. Carruthers
Affiliation:
Dairying Research Corporation, Private Bag 3123, Hamilton, New Zealand
P. G. Neil
Affiliation:
Dairying Research Corporation, Private Bag 3123, Hamilton, New Zealand
D. E. Dalley
Affiliation:
Dairying Research Corporation, Private Bag 3123, Hamilton, New Zealand
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Abstract

The effect on digestibility, ruminal metabolites, microbial protein synthesis and milk production of manipulating the non-structural (NSC): structural (SO carbohydrate ratio in a predominantly pasture diet was investigated in cows in early (trial 1) and late (trial 2) lactation. Twenty-four cows in trial 1 and 15 cows in trial 2 were offered pasture only (P), 0·85 P plus 0·15 NSC/protein mixture (PR), and P plus an additional 0·1 (trial 1) or 0·15 (trial 2) NSC (PE) in a Latin-square arrangement. All diets were isonitrogenous and P and PR were isoenergetic. PE but not PR increased microbial protein synthesis and decreased ruminal ammonia and milk urea levels, compared with P. Efficiency of microbial synthesis (g N per kg digestible organic matter intake) was not altered by treatment. Treatments had minor effects on ruminal pH and no effect on volatile fatty acid concentrations. PE and PR did not affect milk yield or protein yield and decreased fat yield compared with P in trial 1. Milk yield was increased on PE and PR compared with P and was greater on PE than PR, in trial 2. Yields of fat and protein were higher on PE than on P and yield of protein was higher on PR than on P. The results suggest that increasing the ratio of NSC: protein by increasing total carbohydrate intake was more effective in improving nitrogen utilization in the rumen than was increasing the NSC: SC ratio without increasing carbohydrate intake.

Keywords

carbohydratesdairy cowsmilk productionpasture
Type
Research Article
Information
Animal Science , Volume 64 , Issue 3 , June 1997 , pp. 393 - 402
Copyright
Copyright © British Society of Animal Science 1997

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